Thread Cleaning Tap Combo 1.50 & 1.75

The Thread Cleaning Tap Combo 1.50 & 1.75 by ARP is a precision threading tool designed for automotive builders and mechanics who restore or modify engine block surfaces, cylinder heads, and high-performance components. This two-piece tap set addresses a critical need in engine work: cleaning damaged or fouled threads without requiring a complete thread re-drill. Whether you're rebuilding a performance engine, installing ARP fasteners, or repairing bolt holes compromised by corrosion or stripped threads, these taps restore usable threading with minimal material removal.

The combo includes both M1.5 and M1.75 metric thread sizes, covering the smaller fastener applications common in engine bay hardware, sensor bungs, and accessory mounting points. These taps are engineered for manual threading work, allowing controlled depth and feel—essential when working in confined spaces or on specialty castings where automated threading isn't practical. The compact overall length of 4.65 inches fits standard tap handle chucks, while the precision cutting geometry ensures clean thread generation that accepts fasteners without rocking or play, critical for leak-free engine assemblies.

This tap set is indispensable for builders installing ARP fasteners, which demand clean threads for proper clamp load and corrosion resistance. Mechanics servicing import performance platforms, vintage restorations, or small-displacement engines will find these sizes repeatedly necessary. With the right tools, you can ensure that your engine components are securely fastened and perform optimally.